When run as the backend layer, OpenIO SDS is lightweight and requires few resources.
The front layer consists of the gateways (Openstack Swift, Amazon S3) and their services do not require many resources.

Edit the inventory.ini file and with the IP addresses and SSH user (sample here: inventory).

[all]
node1 ansible_host=10.0.0.1 # Change it with the IP of the first server
node2 ansible_host=10.0.0.2 # Change it with the IP of the second server
node3 ansible_host=10.0.0.3 # Change it with the IP of the third server
...